Use the append method in StringBuilder inside a loop body when concatenating multiple strings.
<p>Examples:</p>
<pre>
    Negative example:
    String result;
    for (String string : tagNameList) {
        result = result + string;
    }

    Positive example:
    StringBuilder stringBuilder = new StringBuilder();
    for (String string : tagNameList) {
        stringBuilder.append(string);
    }
    String result = stringBuilder.toString();
</pre>